init function

Initialize the Kushki payment gateway with the provided options.

PARAMETER	TYPE	REQUIRED
`options`	KushkiOptions	YES

It returns a promise from IKushki.

CODE	MESSAGE	EXAMPLE	DESCRIPTION
E011	Library initialization error	{ code: "E011", message: "Error initializing the library" }	If the initialization of the Init instance fails, or there is an error, an error code E011 will be returned. Please try again making sure you enter the card details correctly, if the error persists, please contact Kushki support.